Sterilization unit, and sterilization device and sterilization system comprising same

Abstract

The invention relates to a sterilization unit, and a sterilization device and a sterilization system comprising the same. Wherein the sterilization unit comprises a UVC LED lamp source; the Fresnel lens is arranged corresponding to the UVC LED lamp source, and the Fresnel lens is made of a hydrogenated styrene-butadiene-styrene annular block copolymer; the focal length of the Fresnel lens ranges from 5 mm to 20 mm, and the distance between the UVC LED lamp source and the Fresnel lens ranges from 5 mm to 20 mm. By using the sterilization unit provided by the invention, an expanded effective sterilization range can be obtained.

Description

Technical Field

[0001] This application relates to the field of sterilization units and sterilization devices and systems incorporating the same, and more particularly to a lamp tube type sterilization system and an air conditioning sterilization system, but the present invention is not limited thereto. Background Art

[0002] Ultraviolet light has a shorter wavelength than blue and violet light and cannot be detected by the human eye, belonging to a type of invisible light. Based on the basic physical properties of light, the shorter the wavelength of light, the higher its relative frequency or the higher its energy; for example, blue light in visible light has relatively high energy among visible lights, which makes the public generally worried about the harm of the energy in blue light to the eyes. Since the wavelength of ultraviolet light is much shorter than that of blue light, it can be known that the energy contained is higher than that of blue light. When the energy of ultraviolet light reaches a certain level, it may damage the DNA of microorganisms and affect their replication, expression and other functions, thereby causing the microorganisms to lose their physiological functions and die. Therefore, it is often used for disinfection and sterilization.

[0003] In view of the application and efficacy of ultraviolet light in disinfection and sterilization, in recent years, the industry has developed various UVC LEDs (Ultraviolet-C LEDs, deep ultraviolet light emitting diodes) that are small in size, can be quickly started, and have moderate power to replace traditional mercury lamps. Summary of the Invention

[0004] The inventors have found that when using conventional UVC LEDs as the sterilization light source, the effective sterilization range (distance) of the sterilization device is small, and there is almost no sterilization effect several centimeters away from the sterilization light source. Therefore, it is necessary to use a specific lens in combination with the UVC LED to increase the effective sterilization range.

[0005] In addition, as the optical power of the UVC LED light source increases, its radiation intensity also increases accordingly; however, this may cause the corresponding lens to have a shortened service life. Therefore, under comprehensive consideration, the present invention provides a technical solution to simultaneously solve the technical problems of the effective sterilization range and the lens service life.

[0006] Specifically, on the one hand, the present invention provides a sterilization unit, which includes: a UVC LED light source; and a Fresnel lens, which is disposed corresponding to the UVC LED light source, and the material of the Fresnel lens is hydrogenated styrene-butadiene-styrene cyclic block copolymer; wherein, the focal length of the Fresnel lens is 5 to 20 millimeters, and the distance between the UVC LED light source and the Fresnel lens is 5 to 20 millimeters.

[0007] In some embodiments of the present invention, the sterilization unit has a light efficiency coefficient, which is calculated by the following formula:

[0008] The optical power of the UVC LED light source / the distance between the UVC LED light source and the Fresnel lens; and the light efficiency coefficient is 0.5 to 5.0 mW / mm.

[0009] In some embodiments of the present invention, the optical power of the UVC LED light source is 20 to 40 mW.

[0010] In some embodiments of the present invention, the optical wavelength of the UVC LED light source is 230 to 280 nm.

[0011] In some embodiments of the present invention, the thickness of the Fresnel lens is 0.5 to 3.0 mm.

[0012] In some embodiments of the present invention, the focal length of the Fresnel lens is 5 to 20 mm.

[0013] On the other hand, the present invention provides a tube-type sterilization system, including: the aforementioned sterilization unit, wherein the sterilization unit is disposed on a tube.

[0014] In some embodiments of the present invention, the tube-type sterilization system further includes a human body detection system disposed on the tube or the sterilization unit.

[0015] In some embodiments of the present invention, the sterilization unit has a plurality of UVC LED light sources arranged linearly, and a plurality of Fresnel lenses arranged linearly corresponding to the UVC LED light sources.

[0016] In some embodiments of the present invention, the plurality of Fresnel lenses arranged linearly corresponding to the UVC LED light sources are an integrally formed lamp cover, and the plurality of UVC LED light sources arranged linearly are a UVC LED light strip.

[0017] On yet another aspect, the present invention provides a sterilization device, which includes: a housing; a plurality of the aforementioned sterilization units disposed in the housing; and a base disposed below the housing to fix the plurality of sterilization units; wherein the plurality of sterilization units are arranged radially.

[0018] On still another aspect, the present invention provides an air-conditioning sterilization system, including the aforementioned sterilization device, and the sterilization device is disposed at the air outlet of the air-conditioning system.

[0019] The efficacy of the present invention is that by using the sterilization unit of the present invention, while expanding the effective sterilization range, the technical problem of the service life of the lens can also be solved, and thus the best luminous efficiency can be obtained. Description of the Drawings

[0020] The various technical features of the present application and the relationships between them will be further described below with reference to the accompanying drawings. The drawings are exemplary, and some technical features are not shown to scale. Also, in some of the drawings, technical features that are conventional in the technical field to which the present application pertains and that are not essential for understanding and implementing the present application may be omitted, or technical features that are not essential for understanding and implementing the present application may be shown additionally. That is, the combination of the various technical features shown in the drawings is not used to limit the present application. Additionally, throughout the present application, the content referred to by the same reference numerals is the same. The specific description of the drawings is as follows:

[0021] Figure 1 Schematic diagram of a sterilization unit according to an embodiment of the present invention;

[0022] Figure 2A and 2B Schematic diagram of a lamp tube type sterilization system according to an embodiment of the present invention;

[0023] Figure 3A and 3B Perspective view and top view of a sterilization device according to an embodiment of the present invention respectively;

[0024] Figure 4 Schematic diagram of an air conditioning sterilization system according to an embodiment of the present invention;

[0025] Figure 5 Chart plotted with radiation intensity against the number of start-up hours of UVC LEDs according to an embodiment of the present invention;

[0026] Figure 6 Chart plotted with radiation intensity maintenance rate against cumulative radiation intensity according to an embodiment of the present invention.

[0027] Description of reference numerals: 1C - UVC LED light source; 100 - sterilization unit; 11 - UVC LED light strip; 12 - UVC LED lamp beads; 20 - Fresnel lens; 200A, 200B - lamp tube type sterilization systems; 21 - Fresnel lens lampshade; 30 - human detection system; 300 - sterilization device; 40 - lamp tube; 400 - air conditioning sterilization system; 50 - housing; 60 - base; 70 - air duct; 80 - air outlet; d - distance. Detailed implementation manners

[0028] To make the description of the present invention more detailed and complete, the following provides an illustrative description of the implementation aspects and specific embodiments of the present invention, but this is not the only form for implementing or applying the specific embodiments of the present invention. In this specification and the appended claims, unless the context otherwise indicates, the terms "a" and "the" can also be interpreted as plural. In addition, in this specification and the appended claims, unless otherwise stated, "disposed on something" can be regarded as directly or indirectly contacting the surface of something in the form of attachment or other forms, and the definition of the surface should be judged according to the context / paragraph semantics of the specification content and the common knowledge in the technical field to which the present invention pertains.

[0029] Although the numerical ranges and parameters used to define the present invention are approximate values, the relevant values in the specific embodiments have been presented as precisely as possible here. However, any value inherently inevitably contains standard deviations caused by individual testing methods. Here, "about" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or a range. Or, the term "about" represents that the actual value falls within the acceptable standard error of the average value, which is determined by those with ordinary knowledge in the technical field to which the present invention pertains. Therefore, unless otherwise stated to the contrary, the numerical parameters disclosed in this specification and the accompanying claims are all approximate values and can be changed as needed. At least these numerical parameters should be understood as the values obtained by indicating the significant digits and applying the general rounding method.

[0030] In addition, the blocks shown in the figures herein can be used to represent functions, steps, or hardware, and do not necessarily correspond to physically or logically independent entities; and each block shown in the figures can be implemented in the form of software, hardware, or a combination of software and hardware.

[0031] <Sterilization unit>

[0032] Please refer to Figure 1 , according to some embodiments of the present invention, the sterilization unit 100 includes: a UVC LED light source 10; and a Fresnel lens 20; wherein, there is a distance d between the UVC LED light source 10 and the Fresnel lens 20. As used herein, this distance refers to a straight-line distance, that is, the minimum distance along the straight line between the UVC LED light source 10 and the Fresnel lens 20. According to some embodiments of the present invention, the distance d is 5 to 20 millimeters, specifically, for example, any of the following values or any value between any two of them: 5 millimeters, 10 millimeters, 15 millimeters, and 20 millimeters; preferably 5 millimeters or 10 millimeters. Additionally, according to some embodiments of the present invention, the focal length of the Fresnel lens 20 is 5 to 20 millimeters, specifically, for example, any of the following values or any value between any two of them: 5 millimeters, 7 millimeters, 11 millimeters, 13 millimeters, 15 millimeters, 17 millimeters, 19 millimeters, and 20 millimeters; preferably 5 to 10 millimeters.

[0033] The aforementioned UVC is ultraviolet light with a wavelength of 200 to 280 nanometers. According to some embodiments of the present invention, the light wavelength of the UVC LED light source 10 is 230 to 280 nanometers, and specifically, it can be, for example, the following values or any value between any two of them: 230 nanometers, 235 nanometers, 240 nanometers, 245 nanometers, 250 nanometers, 255 nanometers, 260 nanometers, 265 nanometers, 270 nanometers, 275 nanometers, and 280 nanometers; preferably 275 nanometers.

[0034] The Fresnel lens 20 is arranged corresponding to the UVC LED light source 10, and the material of the Fresnel lens 20 includes a polymer, specifically a copolymer, and is a cyclic block copolymer (Block polymers) of vinyl aromatic (such as styrene)-conjugated diene (such as butadiene). As used herein, "block copolymer" belongs to a subclass of copolymers, which is composed of two or more chain segments, and each of its chain segments is composed of a single structural unit. In addition, the block copolymer can be made by methods such as anionic polymerization technology or catalytic hydrogenation technology, but the present invention is not limited thereto. Preferably, the material of the Fresnel lens 20 is a hydrogenated styrene-butadiene-styrene cyclic block copolymer, which is obtained by hydrogenating a copolymer of styrene and conjugated olefin with a high-efficiency catalyst. According to some embodiments of the present invention, the thickness of the Fresnel lens 20 is 0.5 to 3.0 millimeters, and specifically, it can be, for example, the following values or any value between any two of them: 0.5 millimeters, 1.0 millimeters, 1.5 millimeters, 2.0 millimeters, 2.5 millimeters, and 3.0 millimeters; preferably 1.0 millimeters or 1.5 millimeters.

[0035] According to some embodiments of the present invention, the optical power of the UVC LED light source 10 is 20 to 40 milliwatts, and specifically, it can be, for example, the following values or any value between any two of them: 20 milliwatts, 22 milliwatts, 24 milliwatts, 26 milliwatts, 28 milliwatts, 30 milliwatts, 32 milliwatts, 34 milliwatts, 36 milliwatts, 38 milliwatts, and 40 milliwatts.

[0036] According to some embodiments of the present invention, the sterilization unit 100 has a light efficiency coefficient, which is calculated by the following formula:

[0037] Optical power of the UVC LED light source / Distance d between the UVC LED light source 10 and the Fresnel lens 20

[0038] As used herein, the "luminous efficacy coefficient" is a coefficient / parameter used to evaluate luminous efficiency; not limited by a specific theory, when the luminous efficacy coefficient is within a specific range, the sterilization unit has a good balance between the effective sterilization range and the service life of the lens. The sterilization unit 100 has a luminous efficacy coefficient of 0.5 to 5.0 mW / mm, specifically, for example, any of the following values or any two of them: 0.5 mW / mm, 1.0 mW / mm, 1.5 mW / mm, 2.0 mW / mm, 2.5 mW / mm, 3.0 mW / mm, 3.5 mW / mm, 4.0 mW / mm, 4.5 mW / mm, and 5.0 mW / mm.

[0039] <Lamp tube type sterilization system>

[0040] Please refer to Figure 2A , the lamp tube type sterilization system 200A provided by the present invention includes: a lamp tube 40; a UVC LED strip 11 disposed on the lamp tube 40; and a lamp shade 21 formed by a Fresnel lens (hereinafter referred to as the Fresnel lens lamp shade 21), which is disposed corresponding to the UVC LED strip 11; wherein, the composition of the UVC LED strip 11 and the Fresnel lens lamp shade 21 is Figure 1 the sterilization unit 100 described above. More specifically, the Fresnel lens lamp shade 21 is integrally formed by a Fresnel lens, and the material of the Fresnel lens can be a hydrogenated styrene-butadiene-styrene cyclic block copolymer as described in the previous embodiment.

[0041] On the other hand, the lamp tube type sterilization system 200A may further include a human body detection system 30, which is disposed on the sterilization unit 100 to prevent UVC light from directly irradiating the human body. According to some embodiments of the present invention, the human body detection system 30 includes an infrared sensor, preferably a passive infrared sensor, which refers to a related device that does not emit an infrared beam itself but detects the infrared rays emitted by the human body.

[0042] Continuing to refer to Figure 2B , according to some embodiments of the present invention, the lamp tube type sterilization system 200B is similar in structure and configuration to the aforementioned lamp tube type sterilization system 200A; the difference is that: the lamp tube type sterilization system 200B uses a UVC LED lamp bead 12 as the UVC LED light source of the device.

[0043] According to some embodiments of the present invention, the tube-type sterilization systems 200A and 200B can each further be provided with at least one power connection end (not shown in the figures), at least one power supply (not shown in the figures), and at least one heat dissipation structure (not shown in the figures) on both sides; specifically, the tube-type sterilization system 200A or 200B can be connected to an AC power supply through the power connection end, and then convert the input electric energy through the power supply for use by the UVC LED light source; in addition, by providing the heat dissipation structure, it is beneficial to the operation of the tube-type sterilization system 200A or 200B.

[0044] <Sterilization device>

[0045] Please refer to together Figure 3A and Figure 3B As shown in FIGS. and, the sterilization device 300 provided by the present invention includes: a housing 50; a plurality of sterilization units 100 disposed within the housing 50; and a base 60 disposed below the housing 50 for fixing the plurality of sterilization units 100. According to some embodiments of the present invention, the material of the housing 50 is not limited by the present invention, but preferably the material is hydrogenated styrene-butadiene-styrene cyclic block copolymer. According to some preferred embodiments of the present invention, each of the plurality of sterilization units 100 has a circular shape of the same size, and the Fresnel lens 20 included therein is also circular, and the UVC LED light source 10 is disposed corresponding to the center position of the Fresnel lens 20. Further, the plurality of sterilization units 100 are arranged radially; as used herein, the term "radial arrangement" means that for every three adjacent sterilization units, the connection line of their centers presents the shape of an equilateral triangle. According to some embodiments of the present invention, the sterilization device 300 is a portable sterilization device. According to a more preferred embodiment of the present invention, among the sterilization device 300, the UVC LED light source 10 included in the sterilization unit 100 disposed in the center is different from the UVC LED light sources 10 included in the other sterilization units 100, the former has a light power of 40 milliwatts, and the latter has a light power of 20 milliwatts.

[0046] <Air conditioning sterilization system>

[0047] Please refer to Figure 4 As shown in FIG., the air conditioning sterilization system 400 provided by the present invention includes the sterilization device 300 of the above embodiment, the sterilization device 300 is disposed at the air outlet 80 of the air conditioning system, and the UVC light radiates from the air outlet 80 in the direction of the air duct 70 for sterilization. The material of the air duct 70 is not limited by the present invention, but according to a preferred embodiment of the present invention, the air duct is a tubular object made of aluminum; when the UVC light enters the air duct 70, it can be reflected within the air duct 70 to form a sterilization cavity, and thus can effectively kill bacteria and viruses entering the sterilization cavity.

[0048] <Embodiment>

[0049] In the following, the present invention will be further described in detail with specific embodiments. However, it should be understood that these specific embodiments are only used to help understand the present invention more easily and are not used to limit the scope of the present invention.

[0050] <Example 1>

[0051] A sterilization unit formed by a UVC LED light source with a specification of optical power of 25 mW, 180 mA, and optical wavelength of 275 nm in combination with Fresnel lenses A, B, and C at different distances (specifically shown in Table 1) was tested, and the results of the radiation intensity at different irradiation distances (specifically shown in Table 1) are presented in Table 1. Specifically, the radiation intensity can be used as a parameter to characterize the sterilization effect.

[0052] Table 1 is as follows:

[0053]

[0054] Specifically, the specification of Fresnel lens A is: thickness of 1 mm, diameter of 22 mm, number of engraved circles of 13, and focal length of 7 mm; the specification of Fresnel lens B is: thickness of 1 mm, diameter of 33.9 mm, number of engraved circles of 18, and focal length of 7 mm; the specification of Fresnel lens C is: thickness of 1.5 mm, diameter of 33.9 mm, number of engraved circles of 18, focal length of 7 mm, and it is a double-lens group. And the materials of the three are all hydrogenated styrene-butadiene-styrene cyclic block copolymer.

[0055] In addition, the instrument used to measure the radiation intensity is an ultraviolet irradiometer from Linshang Technology, model LS125UVCLED-x0 UVC detector, ￠10mm, 260 - 285nm LED.

[0056] According to Table 1, the radiation intensity measured without a Fresnel lens at an irradiation distance of 0 cm is 125 mW / cm2 (original value); when the irradiation distance is extended to 10 cm, the measured radiation intensity is 0.0658 mW / cm2, which has a large difference from the original radiation intensity, and its sterilization effect is weak and almost insufficient to effectively sterilize; if the irradiation distance is further extended, the radiation intensity cannot be measured. It can be seen from this that without a Fresnel lens, the UVC LED light source cannot achieve an ideal sterilization effect at an irradiation distance of 10 cm.

[0057] In addition, when the distance between the UVC LED light source and the Fresnel lens is 0 mm, the radiation intensity measured at an irradiation distance of 0 cm is 20.8% to 47.5% of the original value; and even though the irradiation distance is extended to 10 cm, 25 cm, 50 cm or 100 cm, it is still equivalent to the radiation intensity in the case without a Fresnel lens, with no significant benefit.

[0058] When the distance between the UVC LED light source and the Fresnel lens is 5 mm, although the radiation intensity measured at an irradiation distance of 0 cm is lower than that without a Fresnel lens, the radiation intensity is sufficient to provide an effective sterilization effect; the radiation intensity measured at an irradiation distance of 10 cm is 332% to 1217% of that without a Fresnel lens, which obviously has a better sterilization effect than when there is no lens; and the radiation intensity measured at an irradiation distance of 25 cm is 378% to 993% of that without a Fresnel lens, which also has a better sterilization effect than when there is no lens.

[0059] When the distance between the UVC LED light source and the Fresnel lens is 10 mm, the radiation intensity measured at an irradiation distance of 10 cm is 17% to 480% of that without the Fresnel lens.

[0060] As can be seen from the above, setting a specific distance between the UVC LED light source and the Fresnel lens has a significant and positive impact on the radiation intensity at a longer irradiation distance. In this way, the present invention can extend the life of the lens as much as possible (i.e., there is a certain distance between the light source and the lens) while also having a sufficiently good sterilization effect at a longer irradiation distance.

[0061] <Example 2>

[0062] The UVC LED light source with specifications of 40 mW, 360 mA and 275 nm light wavelength was tested as the light source of the central sterilization unit of the air conditioning sterilization system at different distances from Fresnel lenses A, B and C (as shown in Table 2), and the results of the radiation intensity at different irradiation distances (as shown in Table 2) are presented in Table 2. In detail, the specifications of the air conditioning sterilization system are voltage 90 to 240 V, current 360 mA, operating temperature -20 to 50 ° C, storage temperature -20 to 60 ° C, and aluminum heat dissipation module; at the same time, the sterilization device structure used in the air conditioning sterilization system of this embodiment is the same as Figure 3A The sterilization device 300 is the same as that of the embodiment, except that the six surrounding sterilization units are not provided with UVC LED light source irradiation in this embodiment; in addition, the specifications of the Fresnel lenses A, B and C and the ultraviolet irradiator are the same as those described in the previous embodiment.

[0063] Table 2 is as follows:

[0064]

[0065] According to Table 2, when the distance between the UVC LED light source and the Fresnel lens is 0 mm, the radiation intensity measured at an irradiation distance of 0 cm, due to the penetration of UVC light itself and the influence of the optical design of the Fresnel lens, is 34.6% to 71.2% of the original value measured without the Fresnel lens; and as the irradiation distance extends, the measured radiation intensity is comparable to that without the Fresnel lens; thus, it can be seen that when the distance between the UVC LED light source and the Fresnel lens is 0 mm, there is no significant benefit in increasing the irradiation distance.

[0066] When the distance between the UVC LED light source and the Fresnel lens is 5 mm, the radiation intensity measured at an irradiation distance of 10 cm is 451% to 1949% of that without the Fresnel lens, and it obviously has a better sterilization effect compared to without the lens; at the same time, the radiation intensity measured at an irradiation distance of 10 cm is 265% to 2909% of that without the Fresnel lens, and it also has a better sterilization effect compared to without the lens.

[0067] When the distance between the UVC LED light source and the Fresnel lens is 10 mm, the radiation intensity measured at an irradiation distance of 10 cm is 144% to 270% of that without the Fresnel lens, and it has a better sterilization effect compared to without the lens; further, the radiation intensity measured at an irradiation distance of 25 cm is 109.2% to 553.8% of that without the Fresnel lens, and it also has a better sterilization effect compared to without the lens.

[0068] As can be seen from the above, when set in the air-conditioning sterilization system, setting a specific distance between the UVC LED light source and the Fresnel lens also has a significant and positive impact on the radiation intensity for extending the irradiation distance; thereby, it can be inferred that the present invention can also take into account the requirement of extending the lens life under different device forms and provide a sufficiently good sterilization effect at a longer irradiation distance.

[0069] <Example 3>

[0070] This example aims to test the sterilization effect of the actual use of the air-conditioning sterilization system; specifically, in this example, the air-conditioning sterilization system of the present invention is set in both the 22D consulting room and the waiting area in the outpatient area of the hospital as Examples 1 and 2; while the air-conditioning sterilization system is not set in the 20D consulting room, which is used as a comparative example. The air-conditioning sterilization system shares the hospital lighting power supply, and then after continuously illuminating for 2.5 hours, the viable bacteria in these spaces are collected and tested in the following manner.

[0071] Sampling instrument: Use a culture medium of 90mm Trypticase Soy Agar (TSA) and a sampler of Buck Bio-Gulture B30120.

[0072] Specimen sampling: Set the culture medium plate at least 100 cm above the ground, open the culture medium plate and place it on the sampler, and wait to collect an appropriate amount of air samples.

[0073] Inspection standard method: Test according to the NIEA E301.15C standard method and adopt the contact plate method.

[0074] Inspection steps: Place the culture medium in an incubator at 35°C for 2 days, count the number of bacterial colonies on the culture medium, then convert it to the bacterial concentration per cubic meter of air, and present the results in Table 3.

[0075] Table 3 is shown as follows:

[0076]

[0077] Among them, the specifications of the air-conditioning sterilization system are a voltage of 90 to 240V, a current of 360mA, an operating temperature of -20 to 50°C, a storage temperature of -20 to 60°C, and the heat dissipation module is made of aluminum; the structure of the sterilization device used in the air-conditioning sterilization system is the same as that of the sterilization device 300 in Figure 3A Among them, the specifications of the UVC LED light sources of the 6 surrounding sterilization units are 20mW, 275nm, 360mA, and the specifications of the UVC LED light source of the central sterilization unit are 40mW, 275nm, 360mA; and the sterilization unit includes a Fresnel lens A, the specifications of which are the same as those described in the previous embodiment, and the central UVC LED light source is set at a distance of 7 mm from the focal length of the Fresnel lens A (that is, the distance between the central UVC LED light source and the Fresnel lens A is 14 mm).

[0078] According to Table 3, in Comparative Example 1, the air-conditioning sterilization system was not used, so it had no sterilization effect; in contrast, the amount of bacteria in Examples 1 and 2 after using the air-conditioning sterilization system was significantly reduced. Thus, it can be seen that the air-conditioning sterilization system of the present invention substantially has excellent sterilization effects.

[0079] <Example 4>

[0080] This example aims to measure the service life of a hydrogenated styrene-butadiene-styrene cyclic block copolymer Fresnel lens (hereinafter referred to as CBC lens), please refer to Figure 5 and Figure 6Example 4 uses a UVC LED light source with a specification of 40 mW, 360 mA, and a light wavelength of 275 nm to test the radiation intensity maintenance rate of a CBC lens with a specification of 1 mm in thickness, 22 mm in diameter, 13 notch turns, and a focal length of 7 mm under UVC LED irradiation, thereby evaluating the service life of the CBC lens.

[0081] During the test, the UVC sensor was placed 0.8 mm away from the central UVC LED light source; the CBC lens was placed 0.5 to 0.6 mm away from the UVC LED light source; points were recorded, and the CBC lens was temporarily removed to measure the radiation intensity of the UVC LED light source itself. Considering the attenuation of the service life of the UVC LED light source itself, when the cumulative radiation dose reached approximately 661×10⁴ mJ / cm², calculated by the radiation intensity maintenance rate, the radiation intensity of the UVC LED light source decreased from the original 97.4% to approximately 40%, and the test could be ended; among them, the radiation intensity maintenance rate = (radiation intensity with the CBC lens / radiation intensity without the CBC lens) × 100%.

[0082] Continuing from the above, when the radiation intensity maintenance rate of the CBC lens was 40%, the cumulative radiation intensity reached approximately 661×10⁴ mJ / cm² at this time, that is, the service life of the CBC lens only remained 40% of the initial value at the factory. Based on the UVC radiation intensity required for sterilization and the stability required for subsequent products, the present invention uses a radiation intensity maintenance rate of 40% as the replacement threshold for the CBC lens. From the aging test results of this example combined with the data of Examples 1 and 2, it can be understood that the sterilization unit of the present invention can seek a balance between the service life of the lens and the sterilization effect, and with the above replacement threshold, the usage efficiency of the product can be improved.

[0083] In summary, the efficacy of the present invention is that by using the sterilization unit of the present invention, while expanding the effective sterilization range, the technical problem of the service life of the lens can also be solved, and thus the best luminous efficiency can be obtained.

[0084] The term "comprising" used throughout this application should not be construed as limited to the content listed thereafter; it does not exclude other structural elements or steps.

[0085] It can be understood that those skilled in the art can combine the features mentioned in one or more of the embodiments mentioned throughout this application with the features in other embodiments in any appropriate manner to implement this application.

[0086] Note that the above is only the preferred embodiment of the present application and the technical principles applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the technical concept of the present application, more other equivalent embodiments can be included, all of which fall within the protection scope of the present application.

Claims

1. A sterilization unit, characterized in that, it comprises: a UVC LED light source; and a Fresnel lens, which is arranged corresponding to the UVC LED light source, and the material of the Fresnel lens is hydrogenated styrene-butadiene-styrene cyclic block copolymer; wherein, the focal length of the Fresnel lens is 5 to 20 millimeters, and the distance between the UVC LED light source and the Fresnel lens is 5 to 20 millimeters.

2. The sterilization unit according to claim 1, characterized in that, it has a light efficiency coefficient, which is calculated by the following formula: The light power of the UVC LED light source / The distance between the UVC LED light source and the Fresnel lens; and the light efficiency coefficient is 0.5 to 5.0 milliwatts per millimeter.

3. The sterilization unit according to claim 2, characterized in that, the light power of the UVC LED light source is 20 to 40 milliwatts.

4. The sterilization unit according to claim 1, characterized in that, the light wavelength of the UVC LED light source is 230 to 280 nanometers.

5. The sterilization unit according to claim 1, characterized in that, the thickness of the Fresnel lens is 0.5 to 3.0 millimeters.

6. The sterilization unit according to claim 1, characterized in that, the focal length of the Fresnel lens is 5 to 20 millimeters.

7. A lamp tube type sterilization system, characterized in that, it comprises: the sterilization unit according to any one of claims 1-6, and the sterilization unit is arranged on a lamp tube.

8. The lamp tube type sterilization system according to claim 7, characterized in that, it further comprises a human body detection system, which is arranged on the lamp tube or the sterilization unit.

9. The lamp tube type sterilization system according to claim 7 or 8, characterized in that, the sterilization unit has a plurality of UVC LED light sources arranged linearly, and a plurality of Fresnel lenses arranged corresponding to the UVC LED light sources and arranged linearly.

10. The lamp tube type sterilization system according to claim 9, characterized in that, the plurality of Fresnel lenses arranged corresponding to the UVC LED light sources and arranged linearly are an integrally formed lamp shade, and the plurality of UVC LED light sources arranged linearly are a UVC LED light strip.

11. A sterilization device, characterized in that, it comprises: a housing; a plurality of sterilization units as described in claim 1, which are arranged in the housing; and a base, which is arranged below the housing and fixes the plurality of sterilization units; wherein, the plurality of sterilization units are arranged radially.

12. An air conditioning sterilization system, characterized in that, it comprises the sterilization device as described in claim 11, and the sterilization device is arranged at the air outlet of the air conditioning system.

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